Worked out from the recall campaigns and bulletins that list both. It does not mean a part or a repair for one fits the other.
Trims
F-Series Super Duty-Dual Rear Wheels
4x2
Engines
6.7L V8 Diesel
Eighth VIN character C, E, T or X
7.3L V8
Eighth VIN character N
Position 8 of a VIN names the engine on many vehicles: how to read a VIN. Safety equipment depends on the trim, so decode a VIN to see what one vehicle has.